Thanks for sharing your sample dyn file. I tried to convert the NurbsCurve to PolyCurve then Object.ByGeometry but it is showing as null. So I tried to convert it to tiny lines instead. That will be visible in C3D but not the actual curve geometry. For now maybe that is good enough until we get more new nodes. Surely, people can come up with packages and python script but using current out of the box C3D 2020 nodes this is what I end up doing. See attached animated gif.